Originally posted by cdaleracer52 hey leric its jon (champion beadlocks) just wondering are you going to atco today?
ugh, nah can't make it today, might be there friday night and am riding rausch on sat or sunday.. i don't have a ride tonight..no license yet:rolleyes:
i know several that run the ultimate 4 no probs.i believe it is illegal for ama use as the oxy content is to high.but not posotive.i would shy away from any leaded vp fuel.run the unleaded the leaded leaves massive amounts of deposits on the valves and stems.resulting in sticking valves.12:1 compression = race gas not true with our short stroke engines.14:1 i would go 100 octane or higher.
The VP Ultimate 4 is legal for AMA use according to VP. They claim a 6% hosepower gain in stock or modified 4 strokes. That fuel is a leaded fuel as well as being oxygenated and has a 92 motor octane. The VP C10 fuel is also an oxygenated fuel and a good choice, it is unleaded and has a 104 research octane and a 96 motor octane. This fuel is used mostly for IMCA and SCCA race cars. But I cant verify that it is AMA legal. VP does make a fuel that might suit your motor a little better, it is called Motorsport 109. This fuel is made for higher compression engines and is oxygenated fuel. It is designed for higher compression engines with 11:1 or naturally aspirated enigines with a CR of 13:1. This fuel has a motor octane of 101, a research octane of 109, and is an oxygenated fuel. I am not sure, but I think Doug Gust is using this fuel or one very close to it for GNC.
Originally posted by jfarrar i know several that run the ultimate 4 no probs.i believe it is illegal for ama use as the oxy content is to high.but not posotive.i would shy away from any leaded vp fuel.run the unleaded the leaded leaves massive amounts of deposits on the valves and stems.resulting in sticking valves.12:1 compression = race gas not true with our short stroke engines.14:1 i would go 100 octane or higher.
that's why Wade the compression 13.25:1 .. to fit our unleaded 98 octane .... i wonder how the stroke effect here ?
i use the motorsport 109 most of the time.runs very well and you will need to richen your settings a little.when we disassemble my ngine there is no carbon on the piston at all.looks brandnew.